From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 003A8C4332F for ; Wed, 19 Oct 2022 09:25:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233449AbiJSJZ0 (ORCPT ); Wed, 19 Oct 2022 05:25:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58004 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233582AbiJSJYJ (ORCPT ); Wed, 19 Oct 2022 05:24:09 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E8244C512C; Wed, 19 Oct 2022 02:10:54 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id B9DBF61881; Wed, 19 Oct 2022 09:08:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CCE78C433D6; Wed, 19 Oct 2022 09:08:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666170523; bh=Kh8Sla+Un1KkjfHIh8LWbAk/NpfHmZyyc25lnnifXUI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KZvWdf5fteZLWm92HtK/gkC+EEh8tHLxc5ZWTc3oFGo+UfJU1Wr6taiZJAAfMVpfu qxFz8Pc9m9cEp+5G/Q0OHtCEIHHNaPlmyZJsADwXJ9a/q52aJwQwOHzLSUviPVy9/7 NXtreP4JNzTU+11Xe/UaxXss0r+hjOEBiQBefwzk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jerry Ray , "David S. Miller" , Sasha Levin Subject: [PATCH 6.0 688/862] micrel: ksz8851: fixes struct pointer issue Date: Wed, 19 Oct 2022 10:32:55 +0200 Message-Id: <20221019083320.383736530@linuxfoundation.org> X-Mailer: git-send-email 2.38.0 In-Reply-To: <20221019083249.951566199@linuxfoundation.org> References: <20221019083249.951566199@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jerry Ray [ Upstream commit fef5de753ff01887cfa50990532c3890fccb9338 ] Issue found during code review. This bug has no impact as long as the ks8851_net structure is the first element of the ks8851_net_spi structure. As long as the offset to the ks8851_net struct is zero, the container_of() macro is subtracting 0 and therefore no damage done. But if the ks8851_net_spi struct is ever modified such that the ks8851_net struct within it is no longer the first element of the struct, then the bug would manifest itself and cause problems. struct ks8851_net is contained within ks8851_net_spi. ks is contained within kss. kss is the priv_data of the netdev structure. Signed-off-by: Jerry Ray Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/micrel/ks8851_spi.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/micrel/ks8851_spi.c b/drivers/net/ethernet/micrel/ks8851_spi.c index 82d55fc27edc..70bc7253454f 100644 --- a/drivers/net/ethernet/micrel/ks8851_spi.c +++ b/drivers/net/ethernet/micrel/ks8851_spi.c @@ -413,7 +413,8 @@ static int ks8851_probe_spi(struct spi_device *spi) spi->bits_per_word = 8; - ks = netdev_priv(netdev); + kss = netdev_priv(netdev); + ks = &kss->ks8851; ks->lock = ks8851_lock_spi; ks->unlock = ks8851_unlock_spi; @@ -433,8 +434,6 @@ static int ks8851_probe_spi(struct spi_device *spi) IRQ_RXPSI) /* RX process stop */ ks->rc_ier = STD_IRQ; - kss = to_ks8851_spi(ks); - kss->spidev = spi; mutex_init(&kss->lock); INIT_WORK(&kss->tx_work, ks8851_tx_work); -- 2.35.1